Jamieson, Fausset and Brown on Genesis 27:30-35

30-35. Esau came in from his hunting--Scarcely had the former scene been concluded, when the fraud was discovered. The emotions of Isaac, as well as Esau, may easily be imagined--the astonishment, alarm, and sorrow of the one; the disappointment and indignation of the other. But a moment's reflection convinced the aged patriarch that the transfer of the blessing was "of the Lord," and now irrevocable. The importunities of Esau, however, overpowered him; and as the prophetic afflatus was upon the patriarch, he added what was probably as pleasing to a man of Esau's character as the other would have been.